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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee53e20cbf82765dd7a6410944c5d1d056d89fb6ddc96c2e4abc3ac29e80b84' 
  AND token = '2vWuNOstfx5Y5YQENRRPa9oy/copx+JuWmUlDzD7KMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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