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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62e6be0197ea019997d8787d92cd2d821b46be776c428d38cdb3b64c11ebfa6' 
  AND token = 'z11jPNTtXvKAH72Hc4yakNPksSdiGTRB5z3cXgpmu38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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