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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3ba6ef8e7f2671be0cf0780d9ce0aa3ef0f8a8828483ecdb3d795acdc2f11c' 
  AND token = 'vNOkswRy82M2kZZPqnrsDSF9WbJzz8BJzQZQWTb9xGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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