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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a7e30b31e6c5a55ac317cdd355a50600034e0b2d4dfd6da930600ea733c286' 
  AND token = 'bGjlFZlZGfnmcfSywuWt9Afk4OZRJAbINbS2Ne3HEJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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