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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8129a75eeef7710944ae69045547c852f0e96b1184826df3aef1c10a46d4c626' 
  AND token = 'NnOrYweKtK2BX57wW1xLy0hW92U+TLkqCTx+IgYbx9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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