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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582b6722f02da0c5355e5a449f5044ee48bcc2a3b6d2c888fdefcc800a5205ec' 
  AND token = 'qaPztJtGJ2D9Yxzz8pBGyRQkVYxQn6bc4VifcPu29O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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