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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40186b4a2366c09a81a2916ff0b58e255f898fd51b689aa0a114a66b9bbcc6e1' 
  AND token = 'Gvc6O9noR5q7hKw1Ov/6roa0rqd2iejFBU6OHYnML0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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