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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57da300f077e64e618ab13e6e661394a1c8538b1504b35776bd51bafd4fc55d' 
  AND token = '1iuXBtLwNl3ejmUPJZGzPerRTwihe/ubLMMitZBWG5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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