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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d19d01dbbfa19f71f32db865f866501ef77972acfa41d828c7b7f7cb4c249a5' 
  AND token = '6a1mmOv8Fb9XTEyyUh6DHvNI6Ky8BRwA+YiOJLCpqm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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