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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f3d12f4a3f46b4925ebc222ad8167124c5929d0f4ac9f5158d620d023659e7' 
  AND token = '0whm0cbzR8MN0fQYpxjsHYBVHPQSo7e3Tl/SOiDMtCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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