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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726aef69bab65377e839b6a7ffcf1609086649d994fca17b6394cc38385dbfcf' 
  AND token = 'rWi+czut1peDjKx7inYYf8Al3gMVgmfYMk5Utm+P8Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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