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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6669088aae1bafb6c7384a4751220c6ab611591fa7c2d08b7b48c2ad2b0b08' 
  AND token = 'X+6NgJbTZm0LXHR35Q/qB4ObJowBOOM68XJ6OL/AY/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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