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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cf7e9db4d063d60a1bfef29d37cdace880e6c467e1934eb60e6cc4e0bd7a8e' 
  AND token = '4Tm4GrfND7XQBvfaB6tgggmUoiVV4UUwxvmvVbUmswA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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