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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7fcb309f1b59dacd07ab5400d846a3595341d209ea0589fc1f4075c3e05622' 
  AND token = 'XVLIU2PHyrCCHkPO3SRriuT4SFFZvFidT3QJR5XfsvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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