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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c569c1bab2727ef2c50e6976f7ba6ac0a92eb3414d8db051d69beaf215c9a683' 
  AND token = 'fVcJmly8t4vAaiWyKoqLfv4u3HVsqjcoLRv9OM4HsQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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