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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0155d0a3d935f3ae650f4fda74baa51430793348d077265353df44563cadffb0' 
  AND token = '75c63hWXNe42RqU3VkhFuUmAoCc6yWTW8bXykVf6rIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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