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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713f78286ae235f9cdd0788aa618082b685b8c779e33c7c448af89df84b3f542' 
  AND token = '7vF/a/bBhutKGtrOr9bzZdfb8mAsUtK5OMjedEf+75Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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