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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df41b9206bca8cc7efa6ae15a1db6b57f520e4a796fe2ade0f4faa1d88ccbb28' 
  AND token = 'uajTHYjI8JY/ZsS3Iz3KibOlB4bDGyBxJ23gZ/ine5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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