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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b89b9f461ee58db7f47712445df32a9edcad2a09cf90c7bda991e962c9e21a' 
  AND token = 'YlJVY8y02vOdiqFQEZA0XarQgUzeXxnGYbFhoN8kZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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