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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a7728926a63f8475754270c15534026453adf88c2564421e1109782b3de926' 
  AND token = 'K1ycw8RYD/8FnVzxdNGlKxLGlwgT8Sb3mExuTcz5x0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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