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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9d66e08ea87694fe424e2e0ba0b2e36ace38114f99573ae39e8d9e8b66f6d3' 
  AND token = 'CKhyM+lgU7R8FFxN0f0VqDl45mi+7mYHefXjrspZhNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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