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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ba063a61a67869336593660f9d3ea088f81f307d9b5f61df473f269a147e1d' 
  AND token = 'AuM77DGr7ZU4AQRiKVRqc0Y+DO5ZMF56c8Wc4rCHnIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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