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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddfe30f63b55ecd52eed64dec342bca528419115255195c54e5118cfa13c533' 
  AND token = 'T1gYJo3pf9PXkxF8U2OLN13xAJfXdGlO9KhxfrdJagw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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