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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ef0275703133be1882801b6d183e1a161a0a62f7bda6967710ea06a7513525' 
  AND token = 'xOohd74PH/WADpH+bkAhXD1TU7/YKGFzCjF9fQ++ob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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