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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64789d2a6fc464dc2e876faac1732bfeb4f7e3ca9602d83338d882b2ef889640' 
  AND token = '/w0x5P1P/ipZy7pEMK5yeaKl1IFdbznAvMdhci+18Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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