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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da78b0516cdb424b07551afbff54e6f3c1937798e5c41b3f8c2fea82ea15cc23' 
  AND token = 'nwktRKUD206hgtksKG2zB6aUmdFLl8If94+8wUQmOQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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