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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c00db72725b5d89b48b7fe4cc660345859bb70b9b6884b56fe627de38032f53' 
  AND token = 'Ug6ZcgLfURoUBpz/8fgPDTvPQB1WTXp7AbsTd7tafGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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