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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f997f6ee1e520c51e4e27490a51e80a703a9cea5ea48d80dd89aaad34dc91541' 
  AND token = 'OX7fPYll5wvnqGnzzrV95ZouQLrxzEFczXyvCnRg8QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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