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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f762b752da4bd04796d5d1f242fc92c39c8b5cf2b13079f2f0a0d871a3641f' 
  AND token = 'a15N5A96KeH3HnLqoKHGzpF5lRPm/jAY37Bner70YcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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