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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9014e85f11de8a92956240561faf2fe16c440bddf93f0150f7856f385bea7acf' 
  AND token = 'hbo00xgWrCYPNoeh17HaV8PxLU9yk9i3DwCP3DXaUis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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