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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4f56fa501f41a4790700569062afff8669502e6a4bb33236be015609fb8377' 
  AND token = 'JTT2x3QDg50F1HCAvIFYRk1j3dH1/XI2O+pV/z5gisM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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