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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa65371eaf0a624477d5bb72a84ab4b08dc7199bd1e5c723c41b8013450f824' 
  AND token = 'i3GqgGdRjn1TJe5jugMK7pGp695slhwZ6W9TMGiUeXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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