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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a503b893ea03ad969e6f9cfe0655ccac1c1758db7176da19d3815b0569cd5b46' 
  AND token = 'DPiP6HT2XQ7VdaSk51smMFKRb4U3EiaCXVX8em6AkqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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