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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6b3dfd09520b3e5aedc02faf9700a526c0d7aa95a7a31b848854d2b32daa31' 
  AND token = 'N7jT3kq/KVUAmM66iNmjv9PQ7eojZioYPkTZkpmunt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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