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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b6582860b369ed1656e882e1498a3ef0bf20b8f068d488697167bf339a7b66' 
  AND token = 'vTxDGEx+D1I/1NuUWHB4R03P7U0J/r2+wQnpozErGFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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