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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39249a89787fb5a04b2d6c2b058413f2da666f85c27c6d7914864bfc9fd46d45' 
  AND token = 'vPkvF/HCN74H2yb+8eepC6HFBI9dEuHY5YubgmtmkJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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