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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309cce7a7f786248c3cb7d3b46bcf4da195f9ef29cc2bfd7d48bad0dd68401a0' 
  AND token = '2oyUnhewLP3QnCQLIC2dDm1ZYR+md8iu6TIsx/ITHNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}