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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03466ee134c1fb033a75bdbaf202aabbf3d9ed5c64d35d57880b7765d11576a2' 
  AND token = 'IUwRY4ohymRpS+WAu9qxAy8bR0GJz9LtXbztXdawKY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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