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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898a5086e8d4cc96e884fdd50d5b430c126f5e613afe7a464f50a7444e070604' 
  AND token = 'pLE3zBEzkA4/oUUVnh1bShCNA8vWUZrusXwVDIVE+c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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