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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498882ff4c0551e14ab89777cc928aebe7f6ec665f24b8c4400a982b9ac3fa16' 
  AND token = 'un005PTYJsJFWwGS/L0B5wQ5Ryv3Xm/hxPk3F4Edgf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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