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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc73c45f2c51d54e1e7e6ec9aef13370ea9ed9bd00fa550db1aa83586c08a23' 
  AND token = '0DPrYKCbSV8TkBlyHGBrwVEcfxX/OwR9bF5Xl6h8Gho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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