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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31ff46f7de525229b1f4b6868c5d38ec3697928b126ed9c21f0b066c93bdbae' 
  AND token = '1wDTF8K+WoLyx6gbKpwn1kNhdwz7c0lbmiW4122RrL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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