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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9b7b6c922e8f568c7260674a066682282e60baba1fa7a0de7ea651b7f56a01' 
  AND token = 'hLTyi/jo7EJJMLq2OgmnVVQHHY0X/cPWuFwmV3YmrTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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