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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fefa0697e03b14dfedc177dac0d18038c363bf178cc20d720782aecaf8c310' 
  AND token = 'Cn8r4cS3SjtSwh6GSv7RtLK1Qs8VRjK9x1do3YpQZE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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