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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f19a05902430a6e93bd25874fac8bfc086acbebeee2dbae623d7bd81d1b3cdc' 
  AND token = 'ccq6vTB9SE1mS+cSQ6lCuJgnQfdDj96E8+tb4wvJDp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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