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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f597501809b12f1000db4e40288dfe323725ba9be2c4edcb30dd90168b93e8' 
  AND token = 'Dy9enVVtCxhNM2AGnCVRJ9El27CF+u8J9gvfgqA6Ovw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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