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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce8da70ab1fc2e6f4ddded5bb950fa2afeba72da4916491e9c1ac46f74052d6' 
  AND token = 'RPHowyj3vZ0uwHPg2BiofpmZY4x5Ta3Fvy5d/5m/jlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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