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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36279935a98bb5f72be5a5c5b1859bf22f7330830a73dd1a8d70dd290f6a157c' 
  AND token = 'EJBDu3yjpvYKeVeLrPyTqAwT8V2hsovKAMYkUaEEieo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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