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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff9770d9fd0574d6dfe19cfa3e28a62a95c8c1ed3ddd23eaf9cf596238b3db9' 
  AND token = 'L6hN2Ad4ulnUxaJ/3DTzPgCBWip5t8dkydAg8LJJnUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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