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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f223a0f33609586bb42bd773150ce51bb6046074bd0558ca6ce0c49c5a8fadf9' 
  AND token = 'DmCD4vgU5jUyvWTeIMJIXio3Db4rRhlqezPQfUNaJhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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