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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af2a96bbb9970a65e2693909d47161e2afbfcea69326835684e8faf502b445a' 
  AND token = 'jFN2oSzvCUz56vZ+D38M5k+w8IwZpT+zec9S3/+CH8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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