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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09d1b4429d572693ee8d0bb9cf3b86b877e47c4b1f79e9e13953bcc0a9c178b' 
  AND token = 'DXjNbvvhiezFYt0GNTZWM8whE8S14je7hoH7ilJWnCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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