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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af33930209f8818858af8b215e52a2f2cc78cc4d43fed74d791a03d58318e65' 
  AND token = 'f2YjOX9LPscikWpsxbjEEawbs8Lj/iabED3nLhklQ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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