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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cad279e01eb9bcaf7e4bbceec6cdc6056f31c034e3dd9f851fa78c11ff098b' 
  AND token = 'PkTZN2WZizwnxIn4P+WZS6gEbcEAwMFxn/bn+av4uxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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