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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a3a834697ce9801e567b5665b45afe31a4663f007bd9baad5d32b9700030e2' 
  AND token = 'tHzL1/ZtHSWuc0MO1v96Zc/nBLIuMwEF5ipoUfPnMQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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