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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5554c22e2c6614732ab22e238195ad9b61662b56f8863218ca2674fa85b560' 
  AND token = 'Z3jYSepgJFHirAEDoOBi7bSFM7bjty9a/dciTG/6qXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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