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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3ee3eba0c86b56ee000acc8878a685a31c387b08ef98def0efec3070d4ff69' 
  AND token = 'ZKbeuDkDYtVa9QMEnLsd6m3MpX6Vgp/T7LMbixxPOC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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