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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef13eae03115371031de6b761eaa1d6e1de4fadc55ef0dbf6cb1bc06a2187b1' 
  AND token = '4V/+1SEJ9R+ZSiHnzru5XgXBzYGHXJQeA5CRCwZ6aYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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